Bump. I am interested to know myself, and also what the general consensus is on Tascam boards- did the quality of their mixers get better or worse from the 1990's onward, compared to the models I know such as the M308,312, 512, 520, etc.. of the mid-late 1980's.
I had a 2416 back in the nineties. It was replaced with a Mackie 8bus. I was very happy when I got the Mackie. I never liked the EQ on the Tascam. The sound was allways a bit muddy. I couldn't get rid of that sound - perhaps it was my lack of experience at the time but I won't go back to a Tascam board.
The 2500 series was the worst board Tascam ever made. They turned it around completely with the 2600. The EQ's are 100 times better, the pre's are better, everything is better. But you do lose the midi muting.